I will mostly base my critique on the first song “Unseen Realms Final” since this is the finished song. I really hope that you will be able to give the other song the treatment you want to give it.
There is a lot going on that one might not catch on the first listen. Production wise there isn’t a lot I would like to change. Maybe there are here and there some frequencies I’d rather take down a notch, but I’m also quite sensitive to everything over 2k, so it might be my hearing.
The only I think I would give as an recommendation, is to maybe start playing more with your sound design. With this song production wise you are on point, but it feels a bit empty and sterile. So from a sound design stand point you might be able to add some points of interest to add some playfulness and flourishment. Like the bass drum having a slow delay effect and the vocals widening more with a stereo ping pong delay that makes it shimmer on the left and right. Maybe also the drones could use some extra modulation like a phaser or flanger to get some extra movement. Keep in mind these are nitpickings to the overall productions, but might elevate the otherwise good production and add something more.
Musically I could really see this song in 3 different settings. As just an ambient soundtrack this works very well and could go into a game or movie just as it is. But for an album I could see it go 2 different directions. Maybe following it up with a song that is more inspired by Arvo Pärt (like Magnificat), that is also a choral and with the more meditative interweaving writing of Arvo would fit perfectly. Second idea is something darker like Ben Frost that would fit with the darker more ambient side of this song, like in his work for the show “Dark” or “1899”.